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Earthquake Engineering and Engineering Vibration 2016年第1期15卷 79-90页

作者： jae-do kang Hiroshi Tagawa Hyogo Earthquake Engineering Research Center National Research Institute for Earth Science and Disaster Prevention Graduate School of Engineering Hiroshima University

This paper presents results of experimental and numerical investigations of a seesaw energy dissipation system （SEDS） using fluid viscous dampers （FVDs）. To confirm the characteristics of the FVDs used in the tests, harmonic dynamic loading tests were conducted in advance of the flee vibration tests and the shaking table tests. Shaking table tests were conducted to demonstrate the damping capacity of the SEDS under random excitations such as seismic waves, and the results showed SEDSs have sufficient damping capacity for reducing the seismic response of flames. Free vibration tests were conducted to confirm the reliability of simplified analysis. Time history response analyses were also conducted and the results are in close agreement with shaking table test results.

关键词： seesaw energy dissipation system experimental verification shaking table test simplified analysis dynamiccharacteristic

Microstructure comparison of ZK60 alloy under casting,twin roll casting and hot compression

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Transactions of Nonferrous Metals Society of China 2010年第5期20卷 763-768页

作者：王守仁王敏 kang Suk-bong CHO jae-hyung School of Mechanical Engineering University of Ji'nan School of Materials Science and Engineering Shandong University Korea Institute of Materials Science 66 Sangnam-dongChangwon 641010Korea

The microstructures of ZK60 alloy under conventional direct as-casting (DC),twin roll casting (TRC) and twin roll casting followed by hot compression (TRC-HC) were analyzed by optical morphology (OM),electron backscatter diffraction (EBSD) and X-ray diffraction (XRD).The deformation condition of hot compression is 350 ℃,0.1 s?*** microstructural evolution under TRC-HC deformation followed by annealing at different temperatures and time was *** results show that TRC provides more modified microstructure compared with *** are found in TRC processing;dynamic recrystallization (DRX),shear bands and twins are found in TRC-HC.A short annealing time has little effect on hardness,while during a long time annealing,it is found that low annealing temperatures increase the micro-hardness and high temperature decreases it.

关键词： microstructural evolution anneal dynamic recrystallization static recrystallization twin-roll casting hot compression magnesium alloy ZK60

Preventive effect of Angelica gigas Nakai extract oral administration on dry eye syndrome

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Asian Pacific Journal of Tropical Medicine 2018年第6期11卷 369-375页

作者： Younje Lee kang Min Kim jae Seon kang Department of Pharmacy Kyungsung UniversityBusanRepublic of Korea Department of Pharmaceutical Science and Technology Kyungsung UniversityBusanRepublic of Korea

Objective:To identify the preventive effect of Angelica gigas Nakai(*** Nakai)extract in a benzalkonium chloride-induced dry eye ***:A total of 28 mice were divided into 4 groups:1)Normal group:mice received only saline;2)positive control group:mice received an oral solution without *** Nakai extract at 10:00 *** 0.2%benzalkonium chloride eye drops at 2:00 p.m.;3)*** Nakai extract(5 mg);4)*** Nakai extract(10 mg).Both group 3)and group 4)received an oral solution with *** Nakai extract(either 5 mg/kg or 10 mg/kg)at 10:00 *** 0.2%benzalkonium chloride eye drops at2:00 *** 14 d of follow-up,tear volume measurement and fluorescein staining were evaluated for the recovery effects on ocular *** analysis was conducted by hematoxylin and eosin *** on ocular epithelium layer was examined using terminal deoxynucleotidyl transferase-mediated dUTP nick-end labeling *** of TNF-a was also measured using western blot ***:An increase in both the tear volume and the sustained fluorescein staining scores was observed,demonstrating the preventive effects of *** Nakai *** changes such as irregularity of the epithelial layer and corneal epithelial cell death were inhibited in the *** Nakai extract *** of TNF-αmoderately declined;however,its expression level was still higher,compared to the normal ***:Results from the current study show the significant preventive effect of *** Nakai extract in a mouse model of benzalkonium chloride-induced dry eye ***,*** Nakai extract could be considered as an oral preventive agent for dry eye syndrome in the future.

关键词： Angelica gigas Nakai Benzalkonium chloride Dry eye syndrome

Carbon-Coated Three-Dimensional MXene/Iron Selenide Ball with Core–Shell Structure for High-Performance Potassium-Ion Batteries

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Nano-Micro Letters 2022年第1期14卷 278-294页

作者： Su Hyun Yang Yun jae Lee Heemin kang Seung-Keun Park Yun Chan kang Department of Materials Science and Engineering Korea UniversityAnam-DongSeongbuk-GuSeoul 136-713Republic of Korea Department of Advanced Materials Engineering Chung-Ang University4726 Seodong-daeroDaedeok-myeonAnseong-siGyeonggi-do 17546Republic of Korea

Two-dimensional(2D)MXenes are promising as electrode materials for energy storage,owing to their high electronic conductivity and low diffusion ***,similar to most 2D materials,MXene nanosheets easily restack during the electrode preparation,which degrades the electrochemical performance of MXene-based materials.A novel synthetic strategy is proposed for converting MXene into restacking-inhibited three-dimensional(3D)balls coated with iron selenides and *** strategy involves the preparation of Fe_(2)O_(3)@carbon/MXene microspheres via a facile ultrasonic spray pyrolysis and subsequent selenization *** 3D structuring effectively prevents interlayer restacking,increases the surface area,and accelerates ion transport,while maintaining the attractive properties of ***,combining iron selenides and carbon with 3D MXene balls offers many more sites for ion storage and enhances the structural robustness of the composite *** resultant 3D structured microspheres exhibit a high reversible capacity of 410 mAh g^(−1) after 200 cycles at 0.1 A g^(−1) in potassium-ion batteries,corresponding to the capacity retention of 97% as calculated based on 100 *** at a high current density of 5.0 A g^(−1),the composite exhibits a discharge capacity of 169 mAh g^(−1).

关键词： MXene Spray pyrolysis Iron selenide Potassium-ion batteries 3D structures

Characteristics of bifurcation and buckling load of space truss in consideration of initial imperfection and load mode

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第3期14卷 206-218页

作者： Su-deok SHON Seung-jae LEE kang-guk LEE School of Architectural Engineering Korea University of Technology and Education1800 ChungjeolroCheonan ChungnamRepublic of Korea Research Center for Urban Affair Kyungil UniversityGyeongsan-city GyeongbukRepublic of Korea

This study investigated characteristics of bifurcation and critical buckling load by shape imperfection of space truss,which were sensitive to initial *** critical point and buckling load were computed by the analysis of the eigenvalues and determinants of the tangential stiffness *** two-free-nodes example and star dome were selected for the case study in order to examine the nodal buckling and global buckling by the sensitivity to the eigen buckling mode and the analyses of the influence,and characteristics of the parameters as defined by the load ratio of the center node and surrounding node,as well as rise-span ratio were *** sensitivity to the imperfection of the initial shape of the two-free-nodes example,which occurs due to snapping at the critical point,resulted in bifurcation before the limit point due to the buckling mode,and the buckling load was reduced by the increase in the amount of *** two sensitive buckling patterns of the numerical model are established by investigating the displaced position of the free nodes,and the asymmetric eigenmode greatly influenced the behavior of the imperfection shape whether it was at limit point or ***,the sensitive mode of the two-free-nodes example was similar to the in-extensional basis mechanism of a simplified *** star dome,which was used to examine the influence among several nodes,indicated that the influence of nodal buckling was greater than that of global buckling as the rise-span ratio was ***,global buckling is occurred with reaching bifurcation point as the value of load ratio was higher,and the buckling load level was about 50%-70% of load level at limit point.

关键词： Space truss Geometric nonlinearity Initial imperfection Snap-through Bifurcation Global buckling

Genomic organization and transcriptional modulation in response to endocrine disrupting chemicals of three vitellogenin genes in the self-fertilizing fish Kryptolebias marmoratus

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Journal of Environmental Sciences 2016年第4期28卷 187-195页

作者： Bo-Mi Kim Min Chul Lee Hye-Min kang jae-Sung Rhee jae-Seong Lee Department of Biological Science College of ScienceSungkyunkwan University Department of Marine Science College of Natural SciencesIncheon National University

Vitellogenin（Vtg）is the precursor of egg yolk proteins,and its expression has been used as a reliable biomarker for estrogenic contamination in the aquatic *** examine the biomarker potential of the self-fertilizing killifish Kryptolebias marmoratus Vtgs（Km-Vtgs）,full genomic DNAs of Km-Vtgs-Aa,Km-Vtgs-Ab,and Km-Vtgs-C were cloned,sequenced,and *** Vtg genes in *** are tandemly placed in a550 kb section of the same *** silico analysis of promoter regions revealed that both the Km-Vtgs-Aa and Km-Vtgs-Ab genes had an estrogen response element（ERE）,but the Km-Vtgs-C gene did ***,all three Km-Vtgs genes had several ERE-half sites in their promoter *** analysis demonstrated that the three deduced amino acid residues were highly conserved with conventional Vtgs protein,forming distinctive clades within teleost *** tissue showed the highest expression of Km-Vtg transcripts in all tested tissues（brain/pituitary,eye,gonad,intestine,skin,and muscle）in response to endocrine disrupting chemical（EDC）-exposed ***-Vtg transcripts were significantly increased in response to 17β-estradiol（E2）,tamoxifen（TMX）,4-n-nonylphenol（NP）,bisphenol A（BPA）,and octylphenol（OP）over 24 hr *** Km-Vtg-A gene was highly expressed compared to the control in response to NP and ***-induced modulatory patterns of Km-Vtg gene expression were different depending on tissue,gender,and isoforms.

关键词： Kryptolebias marmoratus Vitellogenin Endocrine disrupting chemical

Smooth cutting pattern generation technique for membrane structures using geodesic line on subplane and spline interpolation

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Journal of Central South University 2013年第11期20卷 3131-3141页

作者： SHON Su-deok LEE Seung-jae LEE kang-guk School of Architectural Engineering Korea University of Technology and Education Research Center for Building safety Kyungpook National University

Practical techniques for smooth geodesic patterning of membrane structures were *** the geodesic search,adjustment of the subplane of the extracted elements series was proposed,and various spline approximation methods were used to flatten the strip for the generation of a smooth *** search approach is very simple,and the geodesic line could be easily attained by the proposed method without the need for a difficult computation *** cutting patterning can also be generated by spline approximation without the noise in discrete nodal ***,the geodesic cutting pattern saved about 21%of the required area for the catenary model due to the reduction of the curvature of the planar pattern seam line.

关键词： membrane structures cutting pattern generation geodesic line spline interpolation triangular mesh sub-plane

High-efficiency technique based on dielectrophoresis for assembling metal,semiconductor,and polymer nanorods

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第5期12卷 368-373页

作者： Heng YUAN Kyu-jin KIM Won-seok kang Byoung-ho kang Se-hyuk YEOM jae-ho KIM Shin-won kang School of Electrical Engineering and Computer Science Kyungpook National University 1370 Sankyuk-dong Bukgu Daegu 702-701 Korea) Department of Molecular Science and Technology Ajou University San s.Woncheon-dongYeongtong-guSuwon 443-749Korea School of Electronic Engineering College oflT Engineering Kyungpook National University 13 70 Sankyuk-dong Bukgu Daegu 702-701 Korea

This paper presents a high-efficiency technique based on dielectrophoresis (DEP) for assembling metal, semiconductor, and polymer nanorods, which are synthesized by electrochemical deposition (ECD). The assembly patterns of these nanorods (width: 20 nm; length: 7 μm) were designed using a finite element method (FEM) simulation tool. Further, these nanorods were used in our experiment after their assembly patterns were fabricated. The assembly yield was found to be approximately 70% at an AC voltage of 30 Vp-p and at frequencies of 20 and 30 kHz, and the DC voltage prevented the random alignment of the nanorods at the edge of the assembly pattern. Moreover, the above-mentioned nanorods, which had different permittivities, were found to have similar assembly yields. The proposed method can be improved and applied to nanostructure device fabrication.

关键词： Nanorod Assembly Dielectrophoresis (DEP) Finite element method (FEM) Electrochemical deposition (ECD) method

Defect-rich spinel ferrites with improved charge collection properties for efficient solar water splitting

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Journal of Advanced Ceramics 2023年第3期12卷 612-624页

作者： Runfa Tan Yoo jae Jeong Qu Li Minje kang In Sun Cho Department of Materials Science&Engineering Ajou UniversitySuwon 16499Republic of Korea Department of Energy Systems Research Ajou UniversitySuwon 16499Republic of Korea

Spinel zinc ferrite(ZnFe_(2)O_(4),ZFO)is a potential photoanode material for photoelectrochemical(PEC)water splitting because of its ideal bandgap(1.9–2.1 eV)and superior chemical stability in aqueous ***,the low charge collection efficiency significantly hinders the improvement in PEC ***,we report an ultrafast and effective flame activation route to enhance the charge collection properties of ***,high-temperature flame(>1300℃)facilitated surface and grain boundary diffusions,increasing the grain size and connectivity of the ZFO ***,the reducing atmosphere of the flame enabled the formation of surface defects(oxygen vacancy and Fe^(2+)),thereby increasing the charge carrier density and surface adsorption ***,these two factors promoted charge transport and transfer kinetics,resulting in a 10-fold increase in the photocurrent density over the unactivated ***,we deposited a thin Al_(2)O_(3)overlayer to passivate the ZFO surface and then the NiFeOx oxygen evolution catalyst(OEC)to expedite hole injection into the *** surface passivation and OEC deposition led to a remarkable photocurrent density of~1 mA/cm^(2)at 1.23 V versus the reversible hydrogen electrode,which is the highest value among all reported ZFO ***,the NiFeOx/Al_(2)O_(3)/F-ZFO photoanode achieved excellent photocurrent stability over 55 h(96%retention)and superior faradaic efficiency(FE>94%).Our flame activation method is also effective in improving the photocurrent densities of other spinel ferrites:CuFe_(2)O_(4)(93 times),MgFe_(2)O_(4)(16 times),and NiFe_(2)O_(4)(12 times).

关键词： spinel ferrites flame activation defect-rich surface charge collection photoelectrochemical(PEC) water splitting

Hybrid millimeter wave heterogeneous networks with spatially correlated user equipment

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Digital Communications and Networks 2024年第4期10卷 904-917页

作者： Arif Ullah Ziaul Haq Abbas Ghulam Abbas Fazal Muhammad jae-Mo kang Department of Computer Engineering College of IT ConvergenceChosun UniversityGwangju61452South Korea Faculty of Electrical Engineering GIK Institute of Engineering Sciences and TechnologyTopi23640Pakistan Faculty of Computer Science and Engineering GIK Institute of Engineering Sciences and TechnologyTopi23640Pakistan Department of Electrical Engineering University of Engineering and TechnologyMardan23200Pakistan Department of Artificial Intelligence Kyungpook National UniversityDaegu41566South Korea

In this paper,we analyze a hybrid Heterogeneous Cellular Network(HCNet)framework by deploying millimeter Wave(mmWave)small cells with coexisting traditional sub-6GHz macro cells to achieve improved coverage and high data *** consider randomly-deployed macro base stations throughout the network whereas mmWave Small Base Stations(SBSs)are deployed in the areas with high User Equipment(UE)*** user centric deployment of mmWave SBSs inevitably incurs correlation between UE and *** a realistic scenario where the UEs are distributed according to Poisson cluster process and directional beamforming with line-of-sight and non-line-of-sight transmissions is adopted for mmWave *** using tools from stochastic geometry,we develop an analytical framework to analyze various performance metrics in the downlink hybrid HCNets under biased received power *** UE clustering we considered Thomas cluster process and derive expressions for the association probability,coverage probability,area spectral efficiency,and energy *** also provide Monte Carlo simulation results to validate the accuracy of the derived ***,we analyze the impact of mmWave operating frequency,antenna gain,small cell biasing,and BSs density to get useful engineering insights into the performance of hybrid mmWave *** results show that network performance is significantly improved by deploying millimeter wave SBS instead of microwave BS in hot spots.

关键词： downlink cell association Heterogeneous cellular networks Integrated sub-6GHz and mmWave networks Millimeter wave communications Poisson cluster process